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Conference Paper

#### Movement detectors of the correlation type provide sufficient information for local computation of the 2-D velocity field

##### External Ressource

https://link.springer.com/content/pdf/10.1007%2F978-3-642-74119-7_12.pdf

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##### Citation

Reichardt, W., Schlögl, R., & Egelhaaf, M. (1988). Movement detectors of the correlation
type provide sufficient information for local computation of the 2-D velocity field. In H. Haken (*Neural and Synergetic Computers: Proceedings of the International Symposium at Schloß Elmau, Bavaria,
June 13–17, 1988 * (pp. 170-179). Berlin, Germany: Springer.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-EF4F-1

##### Abstract

The projection of the velocity vectors of objects moving in three-dimensional space on the image plane of an eye or a camera can be described in terms of a vector field. This so-called 2-D velocity field is time-dependent and assigns the direction and magnitude of a velocity vector to each point in the image plane. The 2-D velocity field, however, is a purely geometrical concept and does not directly represent the input site of a visual information processing system. The only information available to a visual system is given by the time-dependent brightness values as sensed in the image plane by photoreceptors or their technical equivalents. From spatio-temporal coherences in these changing brightness patterns motion information is computed. This poses the question about whether the spatio-temporal brightness distributions contain sufficient information to calculate the correct 2-D velocity field. Here we show that the 2-D velocity field generated by motion parallel to the image plane can be computed by purely local mechanisms.